package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有的分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2.组装成为父子的树形结构
        //  找到所有的一级分类
        List<CategoryEntity> level1Menu = entities.stream().filter(categoryEntity ->
            categoryEntity.getParentCid() == 0
        ).map(menu -> {
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return level1Menu;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO  1.检查当前删除的菜单，是否被别的地方引用

        //逻辑删除

        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> path = new ArrayList<>();
        findParentPath(catelogId,path);
        Collections.reverse(path);
        return (Long[]) path.toArray(new Long[path.size()]);
    }

    /**
     * 级联更新所有数据
     * @param category
     */
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    private void findParentPath(Long catelogId,List<Long> path){
        //搜集当前节点
        path.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId!=null && byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),path);
        }
    }

    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> collect = all.stream().filter(categoryEntity -> {
            return root.getCatId().equals(categoryEntity.getParentCid());
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return collect;
    }

}